液-汽引射器内液汽混合过程压力及汽液分布特性研究

Pressure and Gas-liquid Distribution Characteristics in the Process of Vapor-Liquid Flow in Ejector

中文关键词: 液-汽引射器  两相流  压力分布  蒸汽分布

英文关键词: Liquid -Vapor Ejector  Two-Phase Flow  Ejection Pressure  Vacuum Degree

中文摘要:

      为了明确液-汽引射器在工作过程中压力及液汽分布特性，采用混合多相流模型及标准k-ε湍流模型，建立了液-汽引射器三维数值计算模型，对液-汽引射器内部的压力及液汽流动状态进行了分析模拟，得到了不同工作流体参数下引射器内部压力及汽液分布规律。研究表明：沿引射器水平中轴线方向，压力及汽相体积分数随工作流体压力的增大而减小，随工作流体温度及流量的变化基本不变；沿引射入口轴线方向，吸入室的压力随工作流体压力的增大而减小，随工作流体温度及流量的变化几乎不变；沿引射入口轴线方向，汽相体积分数随工作流体压力及温度的变化较小，随工作流体流量的增大而增大。这一研究将有助于掌握液汽引射器内部压力及汽相体积分数的变化规律，有助于引射器的科学设计和运行。

英文摘要:

      To make clear of the variation of pressure and Liquid vapor distribution in an ejector, a three-dimensional numerical model of the liquid vapor ejector was established, the internal pressure and flow state of the ejector were simulated by using the mixed multiphase flow model and the standard k-ε turbulence model. The internal pressure and vapor distribution in the ejector were obtained when the working fluid parameters changed. The results show that the pressure and volume fraction of vapor in the horizontal axis of the ejector decrease with the increase of working fluid pressure, and the changes with the working fluid temperature and flow are basically the same. The pressure of the suction chamber in the axis direction of the ejector inlet decrease with the increase of working fluid pressure, and hardly changes with temperature and flow of the fuild; the volume fraction of the vapor in the axis direction of the ejectior inlet has little change with the change of working fluid pressure and temperature, and increase with the increase of working fluid flow rate. The research results will provide theoretical guidance and basis for parameter adjustment of liquid vapour ejector design and practical engineering application.